13:00Sarah-Jane CrawfordThe 1Xtra ChartBBC Radio 1Xtra Duration: 3 hours Sat 7th Jan 2012, 13:00 on 1xtraCounting down the biggest-selling tracks of the week in the 1Xtra Chart. Show more GenresMusicHip Hop, RnB & DancehallEntertainmentBrandSarah-Jane Crawford Source: BBC Online